Question Low tone Knocking/thumping! - F-Series & SuperDuty Diesel Forums

Glockerman · 01-28-2012, 08:24 PM

Hi guys...I was driving my truck to run errands and while at a drive-thru window I started to hear a knocking noise on the right side of my motor. I can feel the knocking if I rest my hand on the air cleaner and when I removed the air filter, it got a little louder, it's like a vacuum thump, but pretty fast, and it's in rhythm with the idle...what can it be?????

WD40 · 01-29-2012, 06:26 PM

Wow, no one have any ideals that can help him here.
Doug

Glockerman · 01-29-2012, 08:59 PM

Thank you Doug for your attention. After doing some research online, it seems like I have a bent pushrod....I'm getting a popping noise from the intake...there's a youtube video of a truck doing the exact same thing and now I'm wondering if the fix is going to be too expensive for me to fix

WD40 · 01-30-2012, 01:27 AM

How many miles are on your truck, it should be covered by the 100.000 Warranty.
Good Luck.
Doug

hulkster · 01-30-2012, 07:48 AM

I would imagine you have a rocker arm failure,exhaust valve not opening/closing properly will cause a ''thump'' noise back through the intake. I have seen alot of rocker failures and in some cases bent push rod and busted lifter on the failed rocker arm

Glockerman · 01-30-2012, 08:03 PM

I have over 124000 miles...no more warranty

@hulkster.... thanks for your response as well. I think you're right, that's what I'm being told by many...i hope that's not too expensive to fix

hulkster · 01-31-2012, 12:48 PM

I guess it depends on where you take it or who you trust,as to how much it will cost, Ford has a kit available for one bank of rockers,new hdwe,etc i would suggest having the entire bank replaced rather than just the failed part. The rockers are secured using a PLASTIC clip that fails and lets the rocker arm come apart.

01-28-2012, 08:24 PM	#1
Glockerman SDD Junior Member Join Date: May 2010 Location: Hesperia, California Posts: 11 Thanks: 3 Thanked 1 Time in 1 Post View Photos By: Glockerman	Low tone Knocking/thumping! Hi guys...I was driving my truck to run errands and while at a drive-thru window I started to hear a knocking noise on the right side of my motor. I can feel the knocking if I rest my hand on the air cleaner and when I removed the air filter, it got a little louder, it's like a vacuum thump, but pretty fast, and it's in rhythm with the idle...what can it be????? __________________ 2008 F-350 Lariat 4x4 6.4L Power Stroke

01-29-2012, 06:26 PM	#2
WD40 SDD Senior Member Join Date: Aug 2005 Location: Benton Arkansas & McAllen Posts: 2,758 Thanks: 57 Thanked 111 Times in 107 Posts View Photos By: WD40	Wow, no one have any ideals that can help him here. Doug __________________ 2006 Ford F-350 Crew Cab Lariat 4X2 PSD 6.0 TorqShift Automatic Transmission, MAG-HYTEC DIFF COVERS Bama ZooDad If you think the 6.0 is bad.....Get a 6.4 2004 35 ft Hitch Hiker 16589 EW. Doug Is it time to go camping yet?

01-29-2012, 08:59 PM	#3
Glockerman SDD Junior Member Join Date: May 2010 Location: Hesperia, California Posts: 11 Thanks: 3 Thanked 1 Time in 1 Post View Photos By: Glockerman	Thank you Doug for your attention. After doing some research online, it seems like I have a bent pushrod....I'm getting a popping noise from the intake...there's a youtube video of a truck doing the exact same thing and now I'm wondering if the fix is going to be too expensive for me to fix __________________ 2008 F-350 Lariat 4x4 6.4L Power Stroke

01-30-2012, 01:27 AM	#4
WD40 SDD Senior Member Join Date: Aug 2005 Location: Benton Arkansas & McAllen Posts: 2,758 Thanks: 57 Thanked 111 Times in 107 Posts View Photos By: WD40	How many miles are on your truck, it should be covered by the 100.000 Warranty. Good Luck. Doug __________________ 2006 Ford F-350 Crew Cab Lariat 4X2 PSD 6.0 TorqShift Automatic Transmission, MAG-HYTEC DIFF COVERS Bama ZooDad If you think the 6.0 is bad.....Get a 6.4 2004 35 ft Hitch Hiker 16589 EW. Doug Is it time to go camping yet?

01-30-2012, 08:03 PM	#6
Glockerman SDD Junior Member Join Date: May 2010 Location: Hesperia, California Posts: 11 Thanks: 3 Thanked 1 Time in 1 Post View Photos By: Glockerman	I have over 124000 miles...no more warranty @hulkster.... thanks for your response as well. I think you're right, that's what I'm being told by many...i hope that's not too expensive to fix __________________ 2008 F-350 Lariat 4x4 6.4L Power Stroke

01-30-2012, 07:48 AM	#5
hulkster SDD Junior Member Join Date: Jan 2012 Location: OHIO Posts: 15 Thanks: 0 Thanked 2 Times in 2 Posts	I would imagine you have a rocker arm failure,exhaust valve not opening/closing properly will cause a ''thump'' noise back through the intake. I have seen alot of rocker failures and in some cases bent push rod and busted lifter on the failed rocker arm

01-31-2012, 12:48 PM	#7
hulkster SDD Junior Member Join Date: Jan 2012 Location: OHIO Posts: 15 Thanks: 0 Thanked 2 Times in 2 Posts	I guess it depends on where you take it or who you trust,as to how much it will cost, Ford has a kit available for one bank of rockers,new hdwe,etc i would suggest having the entire bank replaced rather than just the failed part. The rockers are secured using a PLASTIC clip that fails and lets the rocker arm come apart. __________________ If you can see the enemy,they can see you.

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